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dianella caerulea height

Wondering how tall Dianella caerulea, also known as the Paroo Lily, can grow in your New Zealand garden? Understanding Dianella caerulea height is essential for designing beautiful, low-maintenance landscapes using this robust native. Whether for mass planting, understorey coverage, or feature planting, the size and structure of Dianella caerulea have a big impact on your plant combinations and overall garden design.

Dianella caerulea (Paroo Lily)

Paroo Lily, Flax Lily

Dianella caerulea, commonly known as the NZ Flax Lily or Paroo Lily, is an herbaceous perennial that bears spikes carrying delicate blue and yellow flowers in spring, which are followed by small, blue berries in summer. These are held neatly above the dark green, strap-like leaves. It typically grows to 1 m tall and the same width. Dianella caerulea is suited to adding to mixed plantings, mass planting under trees and shrubs, or on a bank, including in cottage gardens, or maintaining in a container.

Dianella caerulea plants with blue flowers.
  • Suited to regions:
    All regions
  • Plant type:
    Flaxes
  • Height:
    1.00 m
  • Spread:
    1.00 m
  • Flowering time:
    Spring
  • Tolerances:
    Coastal, Extended dry periods, Hardy, Wind
  • Garden uses:
    Borders, Containers, Living areas, Paths & Steps, Ponds, Pool areas
  • Garden styles:
    Backyard, City & Courtyard, Coastal, Frontyard, Japanese, Mediterranean, Modern
A mass planting of Dianella caerulea 'Little Jess' plants with lush, green foliage.
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Dianella 'Little Jess'

Dianella 'Little Jess' is a variety of NZ Flax Lily that bears spikes carrying delicate, blue flowers in spring above lush, mid-green leaves. Small...

From$18.83
Dianella revoluta 'Little Rev' plants in a garden.
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Dianella 'Little Rev'

Dianella 'Little Rev' is a compact, clump-forming evergreen known for its striking blue-grey foliage and architectural form. This Blue Flax-Lily...

From$20.18
dianella-blaze-
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Dianella Blaze

Dianella Blaze features broad and gently arching, bronze-purple leaves that are very showy. It typically grows to 70 cm tall and the same wide...

From$16.13
dianella-caerulea-goddess-
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Dianella Goddess

Dianella Goddess is a variety of the commonly known, NZ Flax Lily, and produces upright, strap-like leaves which are a rich, dark green with a blue...

From$20.18
dianella-revoluta-kentlyn--2
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Dianella Kentlyn

Dianella Kentlyn is a variety of the commonly known, Flax Lily, produces upright, strap-like leaves which are a rich, dark green with a blue...

From$16.13
phormium-pepe-
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Phormium 'Pepe' (Dwarf Flax)

Phormium Pepe is a smaller variety of Flax that produces narrow and sword-like, bright green leaves. It typically grows to just 45 cm tall and the...

From$20.93
Phormium 'Emerald Gem' in a native garden.
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Phormium 'Emerald Gem'

Phormium 'Emerald Gem' is a dwarf variety of Mountain Flax or Wharariki. It produces emerald-green leaves and grows to 60 cm tall and 70 cm wide in...

From$16.13
phormium-pink-panther-
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Phormium 'Pink Panther'

Phormium Pink Panther produces long, sword like leaves that are candy pink with red-bronze margins. This Flax typically grows to 1.2 m tall and the...

From$20.93
Phormium 'Jack Spratt' plants for sale at The Plant Company nursery.
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Phormium 'Jack Spratt'

Phormium 'Jack Spratt' is one of the smallest New Zealand native flax varieties, admired for its narrow, upright leaves in rich bronze to dark...

From$18.23
phormium-chocomint--2
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Phormium 'Chocomint'

Phormium Chocomint is a popular variety of Flax owing to its colourful foliage which brown with green stripes. It grows to 1 m tall and wide in full...

From$24.23
Dianella caerulea (Paroo Lily)

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How tall does Dianella caerulea grow?

The typical Dianella caerulea height ranges from 60 cm to 1 metre under ideal conditions, though some mature specimens may reach up to 1.5 metres in height, especially when planted in optimal soils with adequate moisture. Its upright, strappy foliage forms dense clumps, making it perfect for borders, pathways, and low-maintenance gardens. Flowering stems can rise above the foliage, adding another 30 to 50 cm, decorated in late spring with delicate blue-mauve flowers, followed by striking blue berries.

How Dianella caerulea height fits your landscape

Thanks to its tidy clumping habit and moderate size, Dianella caerulea is incredibly versatile. Its height provides a subtle vertical presence among groundcovers, and it's low enough not to obstruct views in mixed plantings. Whether you're creating a native planting alongside Libertia cranwelliae (Cranwell's Iris), or seeking companions with striking contrasting colour, Daiella caerulea is a reliable choice. For massed effect, plant in groups 40–60 cm apart and enjoy year-round greenery.

Comparing Dianella caerulea height with popular cultivars

If you love the look of the Paroo Lily but want varied heights or a tighter form for smaller spaces, several Dianella cultivars have been bred for compactness or specific colour traits. For example:

These selections allow you to layer different textures and heights, or replace the classic species with better performing or more colourful options.

Combining with other structural plants

Dianella caerulea’s height lends itself to pairing with other bold architectural plants. In New Zealand gardens, it's often combined with striking flaxes such as Phormium 'Rainbow Surprise', Phormium 'Joker', Phormium 'Pink Panther', or Phormium 'Shiraz' for year-round drama and colour contrast.

Summary

In summary, Dianella caerulea height makes it an outstanding choice for borders, garden beds, native plantings, and low-maintenance landscaping across New Zealand. Its moderate size provides structure without overpowering companion plants, while cultivated varieties like Dianella 'Little Jess' and Dianella 'Little Rev' offer even more creative options. Visit our product pages to explore Dianella and other architectural foliage plants perfectly suited to your garden design.


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